Planemo

A Planemo, also known as a Rogue Planet, Orphan Planet or Wondering Planet was planet sized object that did not orbit any star, but instead orbited the galactic center directly, or simply drifted through space without orbiting any larger object.

Planemos were almost always extremely cold, due to the absence of a stars heat to warm them. Planemos were often seen as dangerous, since they were extremely hard to detect, and could cause immense amounts of disruption if they entered a star system. Due to their remote locations and the difficulty detecting them, planemos could often serve as hideouts for criminals evading justice.